Visualization of Dynamic Deformation Behavior of Al-Mg Alloys Using Electronic Speckle Pattern Interferometry

The shear band observed during tensile tests of AA5083 aluminum alloys with different grain sizes were visualized using a two-dimensional electronic speckle pattern interferometer. The effect of grain boundaries on shear band formation was investigated by extracting displacement and strain fields from interference fringe patterns and stress-strain curves. The intensity of stress oscillations and the strain level at which shear bands appeared were dependent on grain size. Small-grained specimens exhibited regular shear band formation with clear serrations, while large-grained specimens showed delayed and irregular bands with reduced stress oscillations. The formation and propagation of shear bands across grain boundaries were further analyzed from the perspective of wave dynamics.